dev_to_dma_chan(9)

dev_to_dma_chan(9) 💅

okay so this page is from the Kernel API Manual, and it's literally about dev_to_dma_chan — the little helper that converts a device pointer to its sysfs container object. bestie, it's giving "small function, big lock energy." 🦋

✨ NAME ✨

dev_to_dma_chan — convert a device pointer to its sysfs container object

🌸 SYNOPSIS 🌸

struct dma_chan * dev_to_dma_chan (struct device *dev );

🎀 ARGUMENTS 🎀

• dev — device node

💖 DESCRIPTION 💖

okay so here's the whole entire rule, no cap: Must be called under dma_list_mutex. like, that is the vibe check. 🔒✨

🚨 bestie, do not skip the lock — must is doing a lot of heavy lifting in that sentence. dma_list_mutex is not optional. periodt.

🦋 SEE ALSO 🦋

Kernel file: ./drivers/dma/dmaengine.c — and then the whole linked-up squad is:

• struct dma_chan_tbl_ent(9)
• dma_chan_is_local(9)
• min_chan(9)
• dma_channel_rebalance(9)
• balance_ref_count(9)
• dma_chan_get(9)
• dma_chan_put(9)
• dma_find_channel(9)
• dma_issue_pending_all(9)
• dma_get_slave_channel(9)
• __dma_request_channel(9)
• dma_request_chan(9)
• dma_request_chan_by_mask(9)
• devm_dma_request_chan(9)
• dmaengine_get(9)
• dmaengine_put(9)
• dma_async_device_register(9)
• dma_async_device_unregister(9)
• dmaenginem_async_device_register(9)
• dma_wait_for_async_tx(9)
• dma_run_dependencies(9)

source/version: ./drivers/dma · date: October 2026 — mwah 💋 stay slaying, bestie 🫶